.Xr filemon 1 ,

	filemon \

# $FreeBSD$

PROG=	filemon

SRCS=	filemon.c

.include <bsd.prog.mk>

.\" Copyright (c) 2002

.\"	Daniel O'Connor <darius@dons.net.au>

.\"

.\" Redistribution and use in source and binary forms, with or without

.\" modification, are permitted provided that the following conditions

.\" are met:

.\" 1. Redistributions of source code must retain the above copyright

.\"    notice, this list of conditions and the following disclaimer.

.\" 2. Redistributions in binary form must reproduce the above copyright

.\"    notice, this list of conditions and the following disclaimer in the

.\"    documentation and/or other materials provided with the distribution.

.\"

.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

.\" SUCH DAMAGE.

.\"

.\" $FreeBSD$

.\"

.Dd November 12, 2020

.Dt FILEMON 1

.Os

.Sh NAME

.Nm filemon

.Nd log child process file access using filemon

.Sh SYNOPSIS

.Nm

.Op Fl f Ar trfile

.Ar command

.Sh DESCRIPTION

The

.Nm

utility is a simple wrapper around the

.Xr filemon 4

kernel facility (see that manual page for the file format).

Unlike

.Xr ktrace 1

the trace file can be a named pipe.

The options are:

.Bl -tag -width indent

.It Fl f Ar trfile

Log trace records to

.Ar trfile

instead of

.Pa filemon.out .

.Sh SEE ALSO

.Xr ktrace 1 ,

.Xr filemon 4

.Sh AUTHORS

The

.Nm

utility was written by

.An Daniel O'Connor.

/*-

 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD

 *

 * Copyright (c) 2020 Daniel O'Connor <darius@dons.net.au>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer

 *    in this position and unchanged.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * $FreeBSD$

 */

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/wait.h>

#include <sys/ioctl.h>

#include <dev/filemon/filemon.h>

#include <fcntl.h>

#include <err.h>

#include <unistd.h>

static void

usage(void)

{

	fputs("       filemon [-f trfile] command [...]\n", stderr);

	exit(1);

}

int main(int argc, char **argv) {

	char ch;

	int fm_fd, fm_log;

	pid_t child;

	const char *tracefile = "filemon.out";

	while ((ch = getopt(argc,argv,"f:")) != -1)

		switch((char)ch) {

		case 'f':

			tracefile = optarg;

			break;

		default:

			usage();

		}

	argv += optind;

	argc -= optind;

	/* Need something to run */

	if (argc == 0)

		usage();

	if ((fm_fd = open("/dev/filemon", O_RDWR | O_CLOEXEC)) == -1)

		err(1, "open(\"/dev/filemon\", O_RDWR)");

	if ((fm_log = open(tracefile,

		    O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, DEFFILEMODE)) == -1)

		err(1, "Cannot open trace file %s", tracefile);

	if (ioctl(fm_fd, FILEMON_SET_FD, &fm_log) == -1)

		err(1, "Cannot set filemon log file descriptor");

	if ((child = fork()) == 0) {

		child = getpid();

		if (ioctl(fm_fd, FILEMON_SET_PID, &child) == -1)

			err(1, "Cannot set filemon PID");

		execvp(*argv, argv);

		err(1, "exec of '%s' failed", *argv);

	} else {

		wait(&child);

		close(fm_fd);

	}

}